Hi Guys
I need some help for voltage spike protection. My product is a sensor that operates from a 28VDC supply. The voltage can vary from 18VDC to 32VDC. I have got an adjustable linear regulator (LT3010) on the front end. The regulator can operate from 3VDC to 80VDC. I have got SMLJ36V TVS diode on the front end to provide protection against transients.
I have put the product through about 3 weeks of EMC testing and so far it has passed all RF susceptibility, Emissions, Voltage variation, 600V 10uS Spike ETC.
However the product failed on 80Vdc 100mS spike test, i believe the TVS diode failed as its gone short circuit.
The TVS diode specification is as follows;
Working Peak Reverse Voltage - 36V
Maximum Reverse Voltage - 58.1V
http://www.bourns.com/docs/Product-Datasheets/SMLJ.pdf
So my question is as follows;
I need to be able to clamp the voltage at 80Vdc or less because of the voltage regulator and withstand the 600V 10uS spike.
Can you get TVS diodes with a clamping voltage lower than the working peak reverse voltage?
Any help would be gratefully appreciated.
I need some help for voltage spike protection. My product is a sensor that operates from a 28VDC supply. The voltage can vary from 18VDC to 32VDC. I have got an adjustable linear regulator (LT3010) on the front end. The regulator can operate from 3VDC to 80VDC. I have got SMLJ36V TVS diode on the front end to provide protection against transients.
I have put the product through about 3 weeks of EMC testing and so far it has passed all RF susceptibility, Emissions, Voltage variation, 600V 10uS Spike ETC.
However the product failed on 80Vdc 100mS spike test, i believe the TVS diode failed as its gone short circuit.
The TVS diode specification is as follows;
Working Peak Reverse Voltage - 36V
Maximum Reverse Voltage - 58.1V
http://www.bourns.com/docs/Product-Datasheets/SMLJ.pdf
So my question is as follows;
I need to be able to clamp the voltage at 80Vdc or less because of the voltage regulator and withstand the 600V 10uS spike.
Can you get TVS diodes with a clamping voltage lower than the working peak reverse voltage?
Any help would be gratefully appreciated.